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TAU is an integrated toolkit for performance instrumentation, measurement, and analysis. It provides a flexible, portable, and scalable set of technologies for performance evaluation on extreme-scale HPC systems. This paper describes alternatives for I/O instrumentation provided by TAU and the design and implementation of a new tool, tau_gen_wrapper, to wrap external libraries. It describes three instrumentation techniques preprocessor based substitution, linker based instrumentation, and library preloading based replacement of routines. It demonstrates this wrapping technology in the context of intercepting the POSIX I/O library and its application to profiling I/O calls for the Global Cloud Resolution Model (GCRM) application on the Cray XE6 system. This scheme allows TAU to track I/O using linker level instrumentation for statically linked executables and attribute the I/O to specific code regions. It also addresses issues encountered in collecting the performance data from large core counts and representing this data to correctly identify sources of poor I/O

Characterizing I/O Performance Using the TAU Performance System